Preparation of Hollow BaTiO 3 and Anatase Spheres by the Layer‐by‐Layer Colloidal Templating Method

Hollow BaTiO 3 and anatase spheres were prepared from multilayered colloidal titanate particles. An inorganic precursor, titanium (IV) bis(ammonium lactate) dihydroxide (TALH) (chemical formula: [CH 3 CH(O–)CO 2 –NH 4 ] 2 Ti(OH) 2 ) was used. First, a layer‐by‐layer (LBL) colloid‐templating method was employed using TALH to generate monodispersed hollow titanate spheres. These spheres were then treated in a Ba(OH) 2 solution or distilled water under hydrothermal conditions to transform them into hollow BaTiO 3 or anatase spheres, respectively.